CN104753366A - Positive and negative voltage generating circuit, liquid crystal display module drive system and IP phone - Google Patents
Positive and negative voltage generating circuit, liquid crystal display module drive system and IP phone Download PDFInfo
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- CN104753366A CN104753366A CN201310750818.0A CN201310750818A CN104753366A CN 104753366 A CN104753366 A CN 104753366A CN 201310750818 A CN201310750818 A CN 201310750818A CN 104753366 A CN104753366 A CN 104753366A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/009—Converters characterised by their input or output configuration having two or more independently controlled outputs
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a positive and negative voltage generating circuit, a liquid crystal display module drive system and an IP phone. The positive and negative voltage generating circuit is used for converting external voltage signals into positive voltage and negative voltage needed for the liquid crystal display module, and the positive and negative voltage generating circuit comprises a first rectifying circuit, a first voltage stabilizing circuit, a boosting circuit, a second rectifying circuit and a second voltage stabilizing circuit. The positive and negative voltage generating circuit, liquid crystal display module drive system and IP phone use spike pulse voltage signals generated by the voltage conversion of a power supply module as input voltage to generate the positive voltage and negative voltage needed for the liquid crystal display module, the system power supply conversion efficiency is improved, and the voltage output by the power supply module is more stable.
Description
Technical field
The present invention relates to generating positive and negative voltage and produce circuit, particularly relate to a kind of generating positive and negative voltage be applied in liquid crystal display module drive system and produce circuit.
Background technology
The liquid crystal display module of network telephone needs the DC driven of one group of positive voltage and negative voltage when normal work, existing way is converted by DC-DC to obtain positive voltage needed for liquid crystal display module and negative voltage.Positive voltage needed for liquid crystal display module and the electric current of negative voltage minimum, thus cause DC-DC conversion circuit cost higher, conversion efficiency is poor.Therefore, a kind of with low cost, positive voltage that conversion efficiency is good is designed and circuit for generating negative voltage becomes a large research topic.
Summary of the invention
In view of this, a kind of generating positive and negative voltage need be provided to produce circuit, and it can improve system power supply conversion efficiency.
In addition, also need to provide a kind of liquid crystal display module drive system, it can improve system power supply conversion efficiency.
In addition, also need to provide a kind of network telephone, it can improve system power supply conversion efficiency.
Embodiment of the present invention provides a kind of generating positive and negative voltage to produce circuit, for external voltage signal being converted to positive voltage needed for liquid crystal display module and negative voltage, described generating positive and negative voltage produces circuit and comprises the first rectification circuit, the first voltage stabilizing circuit, booster circuit, the second rectification circuit and the second voltage stabilizing circuit.Described first rectification circuit is used for carrying out rectification to described external voltage signal.Described first voltage stabilizing circuit is electrically connected on described first rectification circuit, for the external voltage signal after rectification being carried out voltage stabilizing to obtain the negative voltage needed for described liquid crystal display module.Described booster circuit is used for described external voltage signal to carry out boosting to export the first voltage.Described second rectification circuit is electrically connected on described booster circuit, for carrying out rectification to described first voltage.Described second voltage stabilizing circuit is electrically connected on described second rectification circuit, for the first voltage after rectification being carried out voltage stabilizing to obtain the positive voltage needed for described liquid crystal display module.
Preferably, described generating positive and negative voltage generation circuit also comprises the first filter circuit and the second filter circuit.Described first filter circuit is electrically connected on described first voltage stabilizing circuit, carries out filtering for the negative voltage exported described first voltage stabilizing circuit.Described second filter circuit is electrically connected on described second voltage stabilizing circuit, carries out filtering for the positive voltage exported described second voltage stabilizing circuit.
Preferably, described booster circuit comprises charge/discharge unit.Described charge/discharge unit is used for carrying out discharge and recharge according to described external voltage signal, superposes to realize boosting to described external voltage signal to make described second voltage and described external voltage signal carry out.
Preferably, described charge/discharge unit is the first electric capacity.Described second voltage is produced by direct voltage output unit, and described direct voltage output unit comprises direct voltage source, the first resistance and the first diode.Described first resistance one end is electrically connected on direct voltage source.The positive pole of described first diode is electrically connected on the other end of the first resistance, and negative electricity is connected to charge/discharge unit and the second rectification circuit, superposes with the direct voltage making described external voltage signal and described direct voltage source export.
Preferably, described charge/discharge unit also for isolating described direct voltage output unit and described first rectification circuit, carries out rectification to make described first rectification circuit to described external voltage signal.
Preferably, described first voltage stabilizing circuit comprises the second resistance and the first voltage-stabiliser tube.Described second resistance one end is electrically connected on the first rectification circuit.The positive pole of described first voltage-stabiliser tube is electrically connected on the other end of the second resistance, minus earth.Described second voltage stabilizing circuit comprises the 3rd resistance and the second voltage-stabiliser tube.Described 3rd resistance one end is electrically connected on the second rectification circuit.The negative electricity of described second voltage-stabiliser tube is connected to the other end of the 3rd resistance, plus earth.
Preferably, described external voltage signal is peaking voltage.
Preferably, the magnitude of voltage of described peaking voltage is for being greater than 7V and being less than 18V, and the current value of described peaking voltage is less than 1mA.
Embodiment of the present invention provides a kind of liquid crystal display module drive system, comprises liquid crystal display module, power supply module and generating positive and negative voltage and produces circuit.Described power supply module is used for powering to the backlight of described liquid crystal display module and chip.Described generating positive and negative voltage produces circuit and comprises the first rectification circuit, the first voltage stabilizing circuit, booster circuit, the second rectification circuit and the second voltage stabilizing circuit.Described first rectification circuit is used for carrying out rectification to described external voltage signal.Described first voltage stabilizing circuit is electrically connected on described first rectification circuit, for the external voltage signal after rectification being carried out voltage stabilizing to obtain the negative voltage needed for described liquid crystal display module.Described booster circuit is used for described external voltage signal to carry out boosting to export the first voltage.Described second rectification circuit is electrically connected on described booster circuit, for carrying out rectification to described first voltage.Described second voltage stabilizing circuit is electrically connected on described second rectification circuit, for the first voltage after rectification being carried out voltage stabilizing to obtain the positive voltage needed for described liquid crystal display module.
Preferably, described generating positive and negative voltage produces circuit and is electrically connected on described power supply module and described liquid crystal display module, for obtaining the peaking voltage produced when described power supply module carries out voltage transitions.
Embodiment of the present invention provides a kind of network telephone, comprises network phone system, liquid crystal display module, power supply module and power input interface.Described power input interface is for receiving the electric power signal of external ethernet electric power system input and being sent to described power supply module, and described power supply module is used for the electric power signal of reception to carry out voltage transitions to power to the backlight of described liquid crystal display module and chip.Described network telephone also comprises generating positive and negative voltage and produces circuit, and described generating positive and negative voltage produces circuit and comprises the first rectification circuit, the first voltage stabilizing circuit, booster circuit, the second rectification circuit and the second voltage stabilizing circuit.Described first rectification circuit is used for carrying out rectification to described external voltage signal.Described first voltage stabilizing circuit is electrically connected on described first rectification circuit, for the external voltage signal after rectification being carried out voltage stabilizing to obtain the negative voltage needed for described liquid crystal display module.Described booster circuit is used for described external voltage signal to carry out boosting to export the first voltage.Described second rectification circuit is electrically connected on described booster circuit, for carrying out rectification to described first voltage.Described second voltage stabilizing circuit is electrically connected on described second rectification circuit, for the first voltage after rectification being carried out voltage stabilizing to obtain the positive voltage needed for described liquid crystal display module.
Preferably, described generating positive and negative voltage produces circuit and is electrically connected on described power supply module and described liquid crystal display module, for obtaining the peaking voltage produced when described power supply module carries out voltage transitions.
Above-mentioned generating positive and negative voltage produces the peaking voltage signal that produces when power supply module is carried out voltage transitions by circuit, liquid crystal display module drive system and network telephone as input voltage to produce positive voltage needed for liquid crystal display module and negative voltage, improve system power supply conversion efficiency, make power supply module output voltage more stable simultaneously.
Accompanying drawing explanation
Fig. 1 is the module map in liquid crystal display module drive system one execution mode of the present invention.
Fig. 2 is the module map that generating positive and negative voltage of the present invention produces in circuit first execution mode.
Fig. 3 is the module map that generating positive and negative voltage of the present invention produces in circuit second execution mode.
Fig. 4 is the circuit diagram that in second embodiment of the invention, generating positive and negative voltage produces circuit.
Fig. 5 is the circuit diagram of liquid crystal display module drive system in an embodiment of the present invention.
Fig. 6 is the module map of network telephone in an embodiment of the present invention.
Fig. 7 is the circuit diagram of network telephone in an embodiment of the present invention.
Main element symbol description
Network telephone 100
Liquid crystal display module drive system 1,1a
Power supply module 10,10a, 10b
Generating positive and negative voltage produces circuit 20,20a, 20b
Liquid crystal display module 30
Power over Ethernet system 40
Power input interface 50
Network phone system 60
First rectification circuit 202
First voltage stabilizing circuit 204
Booster circuit 206
Charge/discharge unit 2062
Direct voltage output unit 2064
Second rectification circuit 208
Second voltage stabilizing circuit 210
First filter circuit 212
Second filter circuit 214
First to the 7th resistance R1, R2, R3, R4, R5, R6,
R7
First to the 3rd diode D1, D2, D3
First switch element Q1
First to the 6th electric capacity C1, C2, C3, C4, C5, C6,
C7
First to fourth voltage stabilizing didoe Z1, Z2, Z3, Z4
Transformer T1
Direct voltage source U1
Positive voltage VGH
Negative voltage VGL
External input voltage Vin
Following embodiment will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Embodiment
Fig. 1 is liquid crystal display module drive system 1 module map in an embodiment of the present invention.In the present embodiment, liquid crystal display module drive system 1 comprises power supply module 10, generating positive and negative voltage produces circuit 20 and liquid crystal display module 30, and power supply module 10 and generating positive and negative voltage produce the voltage that circuit 20 provides required for driving liquid crystal display module 30.External input voltage Vin is converted to voltage needed for liquid crystal display module 30 to power to liquid crystal display module 30 by power supply module 10, in the present embodiment, the voltage that power supply module 10 exports is mainly the power supply such as backlight (10V), chip (3.3V) in liquid crystal display module 30.Generating positive and negative voltage produces circuit 20 and is electrically connected at power supply module 10, and generating positive and negative voltage produces circuit 20 and provides required positive voltage VGH and negative voltage VGL for liquid crystal display module 30 normally shows.In the present embodiment, the positive voltage VGH needed for liquid crystal display module 30 is 18V, and negative voltage VGL is-7V.
It should be noted that, positive voltage VGH needed for liquid crystal display module 30, the electric current of negative voltage VGL is all less than 1 milliampere, in the present embodiment, positive voltage VGH, the electric current of negative voltage VGL is 0.205 milliampere, poor with its power supply conversion efficiency of existing voltage conversion circuit, in the present embodiment, the peaking voltage signal that generating positive and negative voltage produces when producing circuit 20 by obtaining power supply module 10 and carrying out voltage transitions is as input voltage, then voltage transitions is carried out to produce positive voltage VGH and negative voltage VGL, thus efficiently utilize the peaking voltage signal that power supply module 10 produces, also achieve the peaking voltage signal suppressing that power supply module 10 is produced, make power supply module 10 output voltage more stable.
Fig. 2 is the module map that an embodiment of the present invention generating positive and negative voltage produces circuit 20.In the present embodiment, generating positive and negative voltage generation circuit 20 comprises the first rectification circuit 202, first voltage stabilizing circuit 204, booster circuit 206, second rectification circuit 208 and the second voltage stabilizing circuit 210.In the present embodiment, generating positive and negative voltage produces circuit 20 and external voltage signal is converted to positive voltage VGH needed for liquid crystal display module 30 and negative voltage VGL, the peaking voltage signal of external voltage signal for producing when power supply module 10 carries out voltage transitions.First rectification circuit 202 is for carrying out rectification to external voltage signal.First voltage stabilizing circuit 204 is electrically connected on the first rectification circuit 202, for the external voltage signal after rectification being carried out voltage stabilizing to obtain the negative voltage VGL needed for liquid crystal display module 30.Booster circuit 206 boosts to export the first voltage for being carried out by external voltage signal.
Second rectification circuit 208 is electrically connected on booster circuit 206, for carrying out rectification to the first voltage.Second voltage stabilizing circuit 210 is electrically connected on the second rectification circuit 208, for the first voltage after rectification being carried out voltage stabilizing to obtain the positive voltage VGH needed for liquid crystal display module 30.
Fig. 3 is the module map that another execution mode generating positive and negative voltage of the present invention produces circuit 20a.In present embodiment, shown in generating positive and negative voltage generation circuit 20a and Fig. 2, generating positive and negative voltage generation circuit 20 is substantially identical.Difference is, generating positive and negative voltage produces circuit 20a and also comprises the first filter circuit 212 and the second filter circuit 214, and booster circuit 206 comprises charge/discharge unit 2062 and direct voltage output unit.First filter circuit 212 is electrically connected on the first voltage stabilizing circuit 204, carries out filtering for the negative voltage VGL exported the first voltage stabilizing circuit 204.Second filter circuit 214 is electrically connected on the second voltage stabilizing circuit 210, carries out filtering for the positive voltage VGH exported the second voltage stabilizing circuit 210.
In the present embodiment, the peaking voltage signal of external voltage signal for producing when power supply module 10 carries out voltage transitions.Charge/discharge unit 2062 carries out discharge and recharge according to external voltage signal, and direct voltage output unit 2064 is for exporting the second voltage.When charge/discharge unit 2062 is discharge condition, its discharge voltage superposes with the second voltage, thus the second voltage making charge/discharge unit 2062 direct voltage output unit 2064 can be exported and external voltage signal carry out superposing to realize boosting to external voltage signal, for example, the second voltage can be 5V direct voltage.
Should be noted that, in the present embodiment, charge/discharge unit 2062, also for isolated DC voltage output unit 2064 and the first rectification circuit 202, carries out rectification to make the first rectification circuit 202 pairs of external voltage signals.
Fig. 4 is the circuit diagram that in an embodiment of the present invention, generating positive and negative voltage produces circuit 20b.In the present embodiment, booster circuit 206 comprises charge/discharge unit 2062 and direct voltage output unit 2064.Charge/discharge unit 2062 is the first electric capacity C1.Direct voltage output unit 2064 comprises direct voltage source U1, the first diode D1 and the first resistance R1.The negative electricity of the first diode D1 is connected to one end of the first electric capacity C1, and the positive pole of the first diode D1 is electrically connected on one end of the first resistance R1, and the other end of the first resistance R1 is electrically connected on direct voltage source U1.
First rectification circuit 202 is the second diode D2, and the negative electricity of the second diode D2 is connected to the other end of the first electric capacity C1.First voltage stabilizing circuit 204 comprises the second resistance R2 and the first voltage stabilizing didoe Z1, and second resistance R2 one end is electrically connected on the positive pole of the second diode D2, and the other end is electrically connected on the positive pole of the first voltage stabilizing didoe Z1, the minus earth of the first voltage stabilizing didoe Z1.First filter circuit is the second electric capacity C2, and second electric capacity C2 one end is electrically connected on the common port of the second resistance R2 and the first voltage stabilizing didoe Z1, other end ground connection.By the filtering of the reverse rectification of the second diode D2, the voltage stabilizing of the first voltage stabilizing didoe Z1 and the second electric capacity C2, external voltage signal is made to be converted to negative voltage VGL needed for liquid crystal display module 30.
Second rectification circuit 208 is the 3rd diode D3, and the positive pole of the 3rd diode D3 is electrically connected on the common port of the first electric capacity C1 and outer first diode D1.Second voltage stabilizing circuit 210 comprises the 3rd resistance R3 and the second voltage stabilizing didoe Z2, and the 3rd resistance R3 one end is electrically connected on the negative pole of the 3rd diode D3, and the other end is electrically connected on the negative pole of the second voltage stabilizing didoe Z2, the plus earth of the second voltage stabilizing didoe Z2.Second filter circuit is the 3rd electric capacity C3, and the 3rd electric capacity C3 one end is electrically connected on the common port of the 3rd resistance R3 and the second voltage stabilizing didoe Z2, other end ground connection.By the first electric capacity C1, external voltage signal and the second voltage are carried out superposing to boost to external voltage signal, and by the external voltage signal after boosting by the rectification of the 3rd diode D3 and the voltage stabilizing of the second voltage stabilizing didoe Z2, the filtering of the 3rd electric capacity C3, makes external voltage signal be converted to positive voltage VGH needed for liquid crystal display module 30.
Fig. 5 is the circuit diagram of liquid crystal display module drive system 1a in an embodiment of the present invention.In the present embodiment, liquid crystal display module drive system 1a comprises power supply module 10a, generating positive and negative voltage produces circuit 20b and liquid crystal display module 30.In the present embodiment, power supply module 10a is used for the voltage needed for chip, backlight etc. be converted to by external input voltage Vin in liquid crystal display module 30, and power supply module 10a comprises transformer T1, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, the 7th electric capacity C7, the 3rd voltage stabilizing didoe Z3, the 3rd voltage stabilizing didoe Z4 and the first switch element Q1.In the present embodiment, power supply module 10a is for driving the voltage conversion circuit of liquid crystal display module 30 in prior art, and the specific works principle of its circuit is not described in detail in this.
For example, power supply module 10a is 3.3V voltage conversion circuit, is mainly used in as the chip in liquid crystal display module 30 is powered.The output of transformer T1 is square wave voltage signal, power supply module 10a when reality uses due to the parameter of components and parts or the impact of surrounding environment, the square wave voltage signal of the output of transformer T1 includes noise signal, also be peaking voltage signal, the magnitude of voltage of peaking voltage signal is greater than the magnitude of voltage of square wave voltage signal.The peaking voltage signal that the square wave voltage signal that generating positive and negative voltage produces circuit 20b acquisition transformer T1 output comprises, as input voltage, then carries out voltage transitions to produce positive voltage VGH and negative voltage VGL to power to liquid crystal display module 30.
Fig. 6 is the module map of network telephone 100 in an embodiment of the present invention.In the present embodiment, network telephone 100 is powered by Power over Ethernet system 40.In other embodiments of the present invention, network telephone 100 also can be able to provide the device of electric power signal to power by other.Network telephone 100 comprises power supply module 10, generating positive and negative voltage produces circuit 20, liquid crystal display module 30, power input interface 50 and network phone system 60.Power input interface 50 receives the electric power signal of Power over Ethernet system 40 input and is sent to power supply module 10 to carry out voltage transitions, and power supply module 10 exports the voltage after conversion to power to liquid crystal display module 30, network telephone system 60.In the present embodiment, power supply module 10 is for driving the voltage conversion circuit of liquid crystal display module 30 in prior art, liquid crystal display module 30, power input interface 50 and network phone system 60 are the module realizing this corresponding function in prior art, and its specific works principle is not described in detail in this.
Fig. 7 is the circuit diagram of network telephone 100 in an embodiment of the present invention.In the present embodiment, the voltage that power supply module 10b exports is 3.3V, 5V, 10V, is mainly used in as liquid crystal display module 30, network phone system 60 are powered, as the backlight voltage 10V of chip voltage 3.3V, liquid crystal display module 30.The direct voltage source U1 that generating positive and negative voltage produces in circuit 20b can be obtained by power supply module 10b.
It should be noted that, in the present embodiment, if produce circuit 20b without generating positive and negative voltage to produce positive voltage VGH needed for liquid crystal display module 30 and negative voltage VGL, also positive voltage VGH needed for liquid crystal display module 30 and negative voltage VGL can be obtained by utilizing existing DC conversion module to carry out voltage transitions to the 10V voltage that power supply module 10b exports.
Above-mentioned generating positive and negative voltage produces the peaking voltage signal that produces when power supply module is carried out voltage transitions by circuit, liquid crystal display module drive system and network telephone as input voltage to produce positive voltage needed for liquid crystal display module and negative voltage, improve system power supply conversion efficiency, make power supply module output voltage more stable simultaneously.
Claims (12)
1. generating positive and negative voltage produces a circuit, for external voltage signal being converted to positive voltage needed for liquid crystal display module and negative voltage, it is characterized in that, described generating positive and negative voltage produces circuit and comprises:
First rectification circuit, for carrying out rectification to described external voltage signal;
First voltage stabilizing circuit, is electrically connected on described first rectification circuit, for the external voltage signal after rectification being carried out voltage stabilizing to obtain the negative voltage needed for described liquid crystal display module;
Booster circuit, boosts to export the first voltage for being carried out by described external voltage signal;
Second rectification circuit, is electrically connected on described booster circuit, for carrying out rectification to described first voltage;
Second voltage stabilizing circuit, is electrically connected on described second rectification circuit, for the first voltage after rectification being carried out voltage stabilizing to obtain the positive voltage needed for described liquid crystal display module.
2. generating positive and negative voltage as claimed in claim 1 produces circuit, it is characterized in that, described generating positive and negative voltage produces circuit and also comprises:
First filter circuit, is electrically connected on described first voltage stabilizing circuit, carries out filtering for the negative voltage exported described first voltage stabilizing circuit;
Second filter circuit, is electrically connected on described second voltage stabilizing circuit, carries out filtering for the positive voltage exported described second voltage stabilizing circuit.
3. generating positive and negative voltage as claimed in claim 1 produces circuit, and it is characterized in that, described booster circuit comprises:
Direct voltage output unit, for generation of the second voltage;
Charge/discharge unit, for carrying out discharge and recharge according to described external voltage signal, superposes to realize boosting to described external voltage signal to make described second voltage and described external voltage signal carry out.
4. generating positive and negative voltage as claimed in claim 3 produces circuit, and it is characterized in that, described charge/discharge unit is the first electric capacity, and described direct voltage output unit comprises:
Direct voltage source;
First resistance, one end is electrically connected on direct voltage source;
First diode, positive pole is electrically connected on the other end of the first resistance, and negative electricity is connected to charge/discharge unit and the second rectification circuit, superposes with the direct voltage making described external voltage signal and described direct voltage source export.
5. generating positive and negative voltage as claimed in claim 4 produces circuit, and it is characterized in that, described charge/discharge unit also for isolating described direct voltage output unit and described first rectification circuit, carries out rectification to make described first rectification circuit to described external voltage signal.
6. generating positive and negative voltage as claimed in claim 1 produces circuit, it is characterized in that,
Described first voltage stabilizing circuit comprises:
Second resistance, one end is electrically connected on the first rectification circuit;
First voltage-stabiliser tube, positive pole is electrically connected on the other end of the second resistance, minus earth;
Described second voltage stabilizing circuit comprises:
3rd resistance, one end is electrically connected on the second rectification circuit;
Second voltage-stabiliser tube, negative electricity is connected to the other end of the 3rd resistance, plus earth.
7. generating positive and negative voltage as claimed in claim 1 produces circuit, and it is characterized in that, described external voltage signal is peaking voltage.
8. generating positive and negative voltage as claimed in claim 1 produces circuit, and it is characterized in that, the magnitude of voltage of described peaking voltage is for being greater than 7V and being less than 18V, and the current value of described peaking voltage is less than 1mA.
9. a liquid crystal display module drive system, comprise liquid crystal display module and power supply module, described power supply module is used for powering to the backlight of described liquid crystal display module and chip, it is characterized in that, the generating positive and negative voltage that described liquid crystal display module drive system also comprises as described in claim 1-8 any one produces circuit.
10. liquid crystal display module drive system as claimed in claim 9, it is characterized in that, described generating positive and negative voltage produces circuit and is electrically connected on described power supply module and described liquid crystal display module, for obtaining the peaking voltage produced when described power supply module carries out voltage transitions.
11. 1 kinds of network telephones, comprise network phone system, liquid crystal display module, power supply module and power input interface, described power input interface is for receiving the electric power signal of external ethernet electric power system input and being sent to described power supply module, described power supply module is used for the electric power signal of reception to carry out voltage transitions to power to the backlight of described liquid crystal display module and chip, it is characterized in that, the generating positive and negative voltage that described network telephone also comprises as described in claim 1-8 any one produces circuit.
12. network telephones as claimed in claim 11, is characterized in that, described generating positive and negative voltage produces circuit and is electrically connected on described power supply module and described liquid crystal display module, for obtaining the peaking voltage produced when described power supply module carries out voltage transitions.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310750818.0A CN104753366A (en) | 2013-12-31 | 2013-12-31 | Positive and negative voltage generating circuit, liquid crystal display module drive system and IP phone |
| TW103100748A TW201526497A (en) | 2013-12-31 | 2014-01-09 | Positive and negative voltage generating circuit, liquid crystal display module driving system and network phone |
| US14/262,823 US20150187316A1 (en) | 2013-12-31 | 2014-04-28 | Positive and negative voltage generating circuit, liquid crystal display module driving system, and voice over internet protocol phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310750818.0A CN104753366A (en) | 2013-12-31 | 2013-12-31 | Positive and negative voltage generating circuit, liquid crystal display module drive system and IP phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104753366A true CN104753366A (en) | 2015-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310750818.0A Pending CN104753366A (en) | 2013-12-31 | 2013-12-31 | Positive and negative voltage generating circuit, liquid crystal display module drive system and IP phone |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US20150187316A1 (en) |
| CN (1) | CN104753366A (en) |
| TW (1) | TW201526497A (en) |
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| CN109149926A (en) * | 2017-06-28 | 2019-01-04 | 湖南中车时代电动汽车股份有限公司 | A kind of generating positive and negative voltage generation circuit |
| CN109256936A (en) * | 2018-09-26 | 2019-01-22 | 深圳市普威技术有限公司 | A kind of external VOIP power supply unit |
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| CN112228911A (en) * | 2020-09-30 | 2021-01-15 | 华帝股份有限公司 | Ignition circuit, ignition control method using ignition circuit, stove and double-stove-head stove |
| CN112448576B (en) * | 2020-11-16 | 2022-10-25 | 上海唯捷创芯电子技术有限公司 | Positive and negative voltage charge pump circuit, chip and communication terminal |
| CN114337255A (en) * | 2021-12-31 | 2022-04-12 | 深圳欧陆通电子股份有限公司 | Negative voltage output circuit and power supply |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20150187316A1 (en) | 2015-07-02 |
| TW201526497A (en) | 2015-07-01 |
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